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Showing 1 to 20 of 37 for “"Perturbation Approach"”.

  1. A Singular Perturbation Approach to Power System Dynamics

    Allemong, John JayUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-12T20:54:51Z (GMT). No. of bitstreams: 1 7913370.pdf: 4934947 bytes, checksum: 13fd2a2832762cd4a9a99d26198bc0cd (MD5) Previous issue date: 1978

    uiuc Repository record

  2. A characteristic mode perturbation approach for antenna loading design

    Young, Matthew WilliamUniversity of Illinois at Urbana-Champaign2015

    … properties. However, reactive loading design approaches based on experience, intuition, and modeling are challenged as the demand grows for antennas with increased functionality and performance. New systematic design methods are needed that can manage complicated performance tradeoffs while …

    uiuc Repository record

  3. Nonlinear Control System Stability Metrics via A Singular Perturbation Approach

    Yang, XiaojingOhio University2013

    In this dissertation, Singular Perturbation Margin (SPM) and Generalized Gain Margin (GGM) are proposed as stability metrics for Linear Time-Invariant (LTI) systems, Linear Time-Varying (LTV) systems, Nonlinear Time-Invariant (NLTI) systems and Nonlinear Time-Varying (NLTV) systems, which are: (i) …

    ohiolink Repository record

  4. Adaptive control of flexible joint robot manipulators: A singular perturbation approach

    Ghorbel, FathiUniversity of Illinois at Urbana-Champaign2011

    … trajectory tracking a presented. A second approach based on the method of integral manifolds for singularly perturbed systems is presented next. The known parameter case is treated and stability analysis is included. The method of integral manifolds is then extended to the adaptive case. …

    uiuc Repository record

  5. A perturbation approach to control of rotational/translational maneuvers of flexible space vehicles

    Thompson, Roger CliftonVirginia Tech1985

    An open loop control law is applied to a flexible spacecraft that admits translational, as well as rotational and flexural motion. The translational degrees of freedom are coupled to the rotation and deformation through the active controls applied to the structure. The objective of any maneuver is …

    vt Repository record

  6. Perturbation approach for the radiative transfer equation for 3D moving media and application to accretion disks

    Kryzhevoi, NikolaiUniversität Heidelberg

    Die mehrdimensionale Strahlungstransportgleichung wird mit Hilfe einer stoerungstheoretischen Methode geloest, wobei sich die vollstaendige Loesung durch eine Reihe von 1D Loesungen ergibt. Da die Loesungen von Stoerungen hoeherer Ordnung explizit angegeben werden koennen und die Verfahren, die …

    heid-diss Repository record

  7. Fast half-loop maneuvers for the F/A-18 fighter aircraft using a singular perturbation feedback control law

    Garrett, Frederick EarlVirginia Tech1988

    … This feedback law is developed using a singular perturbation approach. A secondary purpose of this study is to establish a baseline for time optimal half-loop maneuvers. The singular perturbation approach makes it possible to develop a state feedback control law which rotates the velocity vector …

    vt Repository record

  8. Mathematical and numerical modelling of dispersion-managed solitons, autosolitons and self-similar optical pulses

    Boscolo, Sonia A.Aston University2002

    … a weak dispersion map are analysed by means of a perturbation approach. In the case of small dispersion map strengths the average pulse dynamics is described by a perturbation approach (NLS) equation. Applying a perturbation theory, based on the Inverse Scattering Transform method, an analytic …

    aston Repository record

  9. Investigation of tapered multiple microstrip lines for VLSI circuits

    Mehalic, Mark AndrewUniversity of Illinois at Urbana-Champaign2011

    … circuit devices, are modeled using an iteration-perturbation approach applied in the spatial domain. The approach is used first to solve the static problem, and then to iterate on the static solution to obtain the charge and current distributions on the lines at different frequencies. From this …

    uiuc Repository record

  10. Stochastic flow and transport through multifractal porous media

    Essiam, Albert KMassachusetts Institute of Technology2001

    … transport in aquifers have relied on the linear perturbation approach that is accurate for flow fields with log-conductivity variance cr2 less than unity. Several studies have found that the linear perturbation ignores terms that have significant effects on the spectra of the hydraulic gradient …

    mit Repository record

  11. Analysis and Characterization of Fiber Nonlinearities with Deterministic and Stochastic Signal Sources

    Lee, Jong-HyungVirginia Tech2000

    … by comparing with numerical results. First, the perturbation approach is used to solve the nonlinear Schrödinger equation, and its range of validity is determined by comparing to the split-step Fourier method. In addition, it is shown mathematically that the perturbation approach is equivalent to …

    vt Repository record

  12. ΣΚΕΔΑΣΗ ΗΛΕΚΤΡΟΜΑΓΝΗΤΙΚΟΥ ΚΥΜΑΤΟΣ ΑΠΟ ΑΓΩΓΙΜΗ ΕΠΙΦΑΝΕΙΑ ΣΤΟΧΑΣΤΙΚΑ ΑΝΩΜΑΛΗ ΚΑΙ ΧΡΟΝΙΚΑ ΜΕΤΑΒΑΛΛΟΜΕΝΗ

    Χρυσουλίδης, Δημήτριος, Chrissoulidis, DimitriosAristotle University Of Thessaloniki (AUTH)1983

    … OR NONHOMOGENEOUS. USING THE BOUNDARY PERTURBATION APPROACH OR THE PHYSICAL OPTICS INTEGRAL ALONG WITH THE QUASI-STATIONARY APPROXIMATION, IT IS PROVEN THAT THE INCOHERENT POWER SCATTERED FROM A NONSTATIONARY AND HOMOGENEOUS SURFACE VARIES WITH TIME THROUGH THE TIME-VARYING SURFACE …

    greece Repository record

  13. SMALL SIGNAL STABILITY ANALYSIS OF THREE-PHASE MICROGRID SYSTEM IN THE PRESENCE OF CONSTANT POWER LOADS

    KAMALA SRINIVASA RAO2021

    … stability analysis of such systems in real-time. Perturbation methods can be used to determine system impedance. The perturbation approach involves injecting various perturbation signals into the system and determining impedance from the measured voltage and current responses. In this thesis, two …

    nus Repository record

  14. The sensitivity of nuclear magnetic double resonance

    Spencer, Paul Roger2011

    … explanation of the results is given using a perturbation approach based on the concept of spin diffusion. In addition, we have studied the Na spin lattice relaxation in the completely demagnetized state as a function of impurity concentration, and found a rapid initial decrease of spin order. …

    uiuc Repository record

  15. Nonlinear flexural-flexural-torsional dynamics of metallic and composite beams

    Pai, Perng-Jin F.Virginia Tech1990

    … sequence of the Euler angles. A numerical-perturbation approach is used to analyze the response of metallic and composite beams to parametric and external excitations. First, the linear eigenfunctions and natural frequencies are calculated using a combination of the state-space concept and …

    vt Repository record

  16. Dielectric loss determination using perturbation

    Andrawis, Madeleine Y.Virginia Tech1991

    … cavity conductor walls. In this dissertation a perturbation approach is used to separate the conductor loss from the total loss. The loss-free full-field analysis is used to determine the electric current at the conductor boundaries. This current is used to evaluate the perturbed power …

    vt Repository record

  17. An ultrasonic study of point defects in electron-irradiated P-type silicon

    Johnson, Ward Lewis2011

    … point defects in crystals are reviewed and a perturbation approach is introduced which leads to general expressions for the resonance and relaxation strengths in terms of matrix elements of the ultrasonic perturbation. These expressions provide the basis for a discussion of the polarization …

    uiuc Repository record

  18. Alternating conditional expectation (ACE) applied to classification and recommendation problems

    Kozynski Waserman, Fabián ArielMassachusetts Institute of Technology2018

    … space of probability distributions and a small perturbation approach. With this approach, different information theoretic results can be interpreted as linear algebra optimizations based on the norms of vectors in a linear space, which are in general, easier to carry out. Fundamentally, using …

    mit Repository record

  19. Maneuver and control of flexible spacecraft

    Quinn, Roger D.Virginia Polytechnic Institute and State University1985

    … spatially discretizes the equations of motion. A perturbation approach is used to solve the equations of motion. The zero-order equations describing the rigid-body maneuver are independent of the first-order vibration problem which includes small rigid-body motions. The vibration problem is …

    vt Repository record

  20. Dynamics and Control of Flexible Aircraft

    Tuzcu, IlhanVirginia Tech2001

    … equations for each elastic displacement. A perturbation approach permits division of the problem into a nonlinear "zero-order Problem" for the rigid body motions, corresponding to flight dynamics, and a linear "first-order problem" for the elastic deformations and perturbations in the rigid …

    vt Repository record

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